CAIE A Level Biology 9700 · Biological molecules
During exercise, a person sweats to cool down. The evaporation of sweat from the skin helps to lower body temperature. Explain how the structure of water molecules and the resulting hydrogen bonding give water properties that enable sweating to cool the body.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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